UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16
UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of August 2023

Commission File Number: 001-32929

POLYMET MINING CORP.
(Translation of registrant's name into English)

444 Cedar Street, Suite 2060,
St. Paul, MN 55101
(Address of principal executive offices)

Indicate by check mark whether the registrant files or will file annual reports under cover Form 20-F or Form 40-F.

[               ] Form 20-F   [ X ] Form 40-F

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1): [               ]

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7): [               ]

EXPLANATORY NOTE

This report on Form 6-K and attached exhibit are incorporated by reference into Registration Statement No. 333-192208 and this report on Form 6-K shall be deemed a part of such registration statement from the date on which this report on Form 6-K is filed, to the extent not superseded by documents or reports subsequently filed or furnished by PolyMet Mining Corp. under the Securities Act of 1933, as amended, or the Securities Exchange Act of 1934, as amended.

SUBMITTED HEREWITH

Exhibits

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

444 Cedar Street, Suite 2060, St. Paul, MN 55101 Tel: +1 (651) 389-4100 www.polymetmining.com

TSX: POM, NYSE American: PLM

PolyMet Mining reports results for period ended June 30, 2023

St. Paul, Minn., August 10, 2023 - PolyMet Mining Corp. ("PolyMet" or the "company") TSX: POM; NYSE American: PLM, today reports its financial results for the three and six months ended June 30, 2023.

The company experienced three significant events during the period:

• Completed an offering of rights to shareholders of common shares of the company raising approximately $195M in gross proceeds (the "Rights Offering") to repay outstanding debt, fund PolyMet's share of the work program associated with the NewRange Copper Nickel joint venture and certain other corporate activities. The Rights Offering was fully backstopped by Glencore, which now holds approximately 82% of PolyMet shares;
• Received the U.S. Army Corps of Engineers' decision wherein it revoked the Clean Water Act section 404 permit for the NorthMet Project. NewRange continues to evaluate its options and develop strategies to recover the permit; and
• Entered into a definitive agreement with Glencore whereby Glencore will acquire the approximately 17.8% of the issued and outstanding common shares of the company that Glencore does not currently own for $2.11 in cash per share, subject to approval by PolyMet shareholders, court approval and other customary closing conditions (the "Transaction").

In addition, integration efforts related to the NewRange Copper Nickel joint venture continue as planned.

Key Balance Sheet Statistics

(In '000 US dollars)

Key Income and Cash Flow Statement Statistics

(in '000 US dollars, except per share amounts)

• Loss for the three months ended June 30, 2023 was $4.0 million compared with $9.7 million for the prior year.  The decreased loss was primarily due to lower interest expense following the repayment of outstanding debt in April 2023.

• Loss for the six months ended June 30, 2023 was $9.3 million compared with $18.3 million for the prior year.  The decreased loss was primarily due to a gain on the NewRange Copper Nickel transaction in February 2023 and lower interest expense partially offset by NewRange transaction closing costs.

• Cash increased $4.2 million during the three months ended June 30, 2023 and increased $9.2 million during the six months ended June 30, 2023. The increase in cash primarily reflects Rights Offering proceeds during the quarter partially offset by repayment of outstanding debt and deposits with Glencore under the cash management agreement.

The financial statements have been filed at www.polymetmining.com and on SEDAR+ and EDGAR and have been prepared in accordance with International Financial Reporting Standards. All amounts are in U.S. dollars. Copies can be obtained free of charge by contacting the company at 444 Cedar Street, Suite 2060, St. Paul, MN 55101, or by e-mail at info@polymetmining.com. Project developments described above are derived from these documents and should be read in conjunction with them.

*  *  *  *  *

About PolyMet

PolyMet Mining Corp. is a mine development company holding a 50% interest in NewRange Copper Nickel LLC, a joint venture with Teck Resources Limited. NewRange Copper Nickel holds the NorthMet and Mesaba copper, nickel, cobalt and platinum group metal (PGM) deposits, two globally significant clean energy mineral resources located in the Duluth Complex in northeast Minnesota. The Duluth Complex is one of the world's major, undeveloped copper, nickel and PGM metal mining regions. NorthMet is the first large-scale project to have received permits within the Duluth Complex. For more information: www.polymetmining.com

For further information, please contact:

Media

Bruce Richardson, Corporate Communications

Tel: +1 (651) 389-4111

brichardson@polymetmining.com

Investor Relations

Tony Gikas, Investor Relations

Tel: +1 (651) 389-4110

investorrelations@polymetmining.com

PolyMet Disclosures

This news release contains certain forward-looking statements concerning anticipated developments in PolyMet's operations in the future. Forward-looking statements are frequently, but not always, identified by words such as "expects," "anticipates," "believes," "intends," "estimates," "potential," "possible," "projects," "plans," and similar expressions, or statements that events, conditions or results "will," "may," "could," or "should" occur or be achieved or their negatives or other comparable words. Forward-looking statements relate to future events or future performance and reflect management's expectations or beliefs regarding future events including, but not limited to, statements with respect to the anticipated benefits of the 50/50 joint venture, the company's expectations with respect to the future development of NorthMet and Mesaba, and statements with respect to the Transaction. Forward-looking statements address future events and conditions and therefore involve inherent known and unknown risks and uncertainties. Such risks and uncertainties include, but are not limited to, among other things, receipt of regulatory, shareholder and court approvals and timing of closing of the Transaction, and the outcome of the development of the NorthMet and Mesaba projects. Actual results may differ materially from those in the forward-looking statements due to risks facing PolyMet or due to actual facts differing from the assumptions underlying its predictions.

PolyMet's forward-looking statements are based on the beliefs, expectations and opinions of management on the date the statements are made, and PolyMet does not assume any obligation to update (except as required by law) forward-looking statements if circumstances or management's beliefs, expectations and opinions should change.

Specific reference is made to risk factors and other considerations underlying forward-looking statements discussed in PolyMet's most recent Annual Report on Form 40-F for the fiscal year ended December 31, 2022, and in our other filings with Canadian securities authorities and the U.S. Securities and Exchange Commission.

The Annual Report on Form 40-F also contains the company's mineral resource and other data as required under National Instrument 43-101.

No regulatory authority has reviewed or accepted responsibility for the adequacy or accuracy of this release.